123456789101112131415161718192021222324252627282930313233343536373839404142434445 |
- /*=============================================================================
- Copyright (c) 2011 Eric Niebler
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- ==============================================================================*/
- #if !defined(BOOST_FUSION_SINGLE_VIEW_DISTANCE_IMPL_JUL_07_2011_1348PM)
- #define BOOST_FUSION_SINGLE_VIEW_DISTANCE_IMPL_JUL_07_2011_1348PM
- #include <boost/fusion/support/config.hpp>
- #include <boost/mpl/minus.hpp>
- namespace boost { namespace fusion
- {
- struct single_view_iterator_tag;
- namespace extension
- {
- template<typename Tag>
- struct distance_impl;
- template<>
- struct distance_impl<single_view_iterator_tag>
- {
- template<typename First, typename Last>
- struct apply
- : mpl::minus<typename Last::position, typename First::position>
- {
- typedef typename mpl::minus<typename Last::position,
- typename First::position>::type type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type
- call(First const& /*first*/, Last const& /*last*/)
- {
- return type();
- }
- };
- };
- }
- }}
- #endif
|